package com.lagou.dao.impl;

import com.lagou.dao.CourseDao;
import com.lagou.pojo.Course;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * 课程模块DAO层实现类
 *
 * @author StarryHorizon
 * @create 2022-02-11 17:27
 */
public class CourseDaoImpl implements CourseDao {

    //查询课程信息
    @Override
    public List<Course> findCourseList() {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写sql
            String sql = "SELECT\n" +
                    "id,\n" +
                    "course_name,\n" +
                    "price,\n" +
                    "sort_num,\n" +
                    "STATUS\n" +
                    "FROM course WHERE is_del = ?";

            //3.执行查询
            List<Course> courseList = qr.query(sql, new BeanListHandler<Course>(Course.class), 0);
            return courseList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据条件查询课程信息
    @Override
    public List<Course> findByCourseNameAndStatus(String courseName, String status) {

        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL 当前的查询为多条件不定项查询
            //2.1 创建StringBuilder对象，将SQL字符串添加进缓冲区
            //WHERE 1=1是小技巧，防止sql语句错误
            StringBuilder sb = new StringBuilder("SELECT id,course_name,price,sort_num,STATUS FROM course WHERE 1=1 and is_del = ? ");

            //2.2 创建List集合 保存参数
            List<Object> list = new ArrayList<>();
            list.add(0);

            //2.3 判断传入的参数是否为空且不能为""
            if (courseName != null && courseName != "") {
                //sql语句前空一个，防止与前一个的sql语句合在一起
                sb.append(" AND course_name LIKE ?");
                //Like查询 需要拼接%
                courseName = "%" + courseName + "%";
                list.add(courseName);
            }

            if (status != null && status != "") {
                //sql语句前空一个，防止与前一个的sql语句合在一起
                sb.append(" AND STATUS = ?");
                //将status转换为int
                int i = Integer.parseInt(status);
                list.add(i);
            }

            //执行查询
            List<Course> courseList = qr.query(sb.toString(), new BeanListHandler<Course>(Course.class), list.toArray());

            //返回结果
            return courseList;
        } catch (SQLException e) {
            e.printStackTrace();
            //出现异常就返回null
            return null;
        }
    }

    //保存课程营销信息
    @Override
    public int saveCourseSalesInfo(Course course) {
        int row = 0;

        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "INSERT INTO course(\n" +
                    "course_name,\n" +
                    "brief,\n" +
                    "teacher_name,\n" +
                    "teacher_info,\n" +
                    "preview_first_field,\n" +
                    "preview_second_field,\n" +
                    "discounts,\n" +
                    "price,\n" +
                    "price_tag,\n" +
                    "share_image_title,\n" +
                    "share_title,\n" +
                    "share_description,\n" +
                    "course_description,\n" +
                    "course_img_url,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time\n" +
                    ")VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?);";

            //3.准备参数
            Object[] param = {course.getCourse_name(), course.getBrief(), course.getTeacher_name(), course.getTeacher_info(), course.getPreview_first_field(),
                    course.getPreview_second_field(), course.getDiscounts(), course.getPrice(), course.getPrice_tag(), course.getShare_image_title(),
                    course.getShare_title(), course.getShare_description(), course.getCourse_description(), course.getCourse_img_url(), course.getStatus(),
                    course.getCreate_time(), course.getUpdate_time()};

            //4.执行插入操作
            row = qr.update(sql, param);

            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //根据ID查询课程信息
    @Override
    public Course findCourseById(int id) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "SELECT \n" +
                    "id,\n" +
                    "course_name,\n" +
                    "brief,\n" +
                    "teacher_name,\n" +
                    "teacher_info,\n" +
                    "preview_first_field,\n" +
                    "preview_second_field,\n" +
                    "discounts,\n" +
                    "price,\n" +
                    "price_tag,\n" +
                    "course_img_url,\n" +
                    "share_image_title,\n" +
                    "share_title,\n" +
                    "share_description,\n" +
                    "course_description,\n" +
                    "STATUS\n" +
                    "FROM course WHERE id = ?;";

            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), id);
            return course;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //修改课程营销信息
    @Override
    public int updateCourseSalesInfo(Course course) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course SET\n" +
                    "course_name = ?,\n" +
                    "brief = ?,\n" +
                    "teacher_name = ?,\n" +
                    "teacher_info = ?,\n" +
                    "preview_first_field = ?,\n" +
                    "preview_second_field = ?,\n" +
                    "discounts = ?,\n" +
                    "price = ?,\n" +
                    "price_tag = ?,\n" +
                    "share_image_title = ?,\n" +
                    "share_title = ?,\n" +
                    "share_description = ?,\n" +
                    "course_description = ?,\n" +
                    "course_img_url = ?,\n" +
                    "update_time = ?\n" +
                    "WHERE id = ?;";

            Object[] param = {course.getCourse_name(), course.getBrief(), course.getTeacher_name(), course.getTeacher_info(),
                    course.getPreview_first_field(), course.getPreview_second_field(), course.getDiscounts(), course.getPrice(),
                    course.getPrice_tag(), course.getShare_image_title(), course.getShare_title(), course.getShare_description(),
                    course.getCourse_description(), course.getCourse_img_url(), course.getUpdate_time(), course.getId()};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改课程状态(上架&下架)
    @Override
    public int updateCourseStatus(Course course) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course SET STATUS = ?, update_time = ? WHERE id = ?";

            Object[] param = {course.getStatus(), course.getUpdate_time(), course.getId()};

            int row = qr.update(sql, param);

            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }
}
